碳纤维布增强ECC-混凝土复合梁受弯性能分析  

Study on the flexural behavior of ECC-RC composite beams strengthened with CFS

作　　者：严卫华 韩沐阳 葛文杰[1] Yan Weihua;Han Muyang;Ge Wenjie(College of Civil Seience and Engineering,Yanghou Uniersity,Yangzhou 225127,China;Infrastructure Department,Yangzhou University,Yangzhou225009,China)

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225127 [2]扬州大学基建处,江苏扬州225007

出　　处：《建筑科学》2022年第9期46-56,共11页Building Science

基　　金：国家自然科学基金资助项目(51678514,51308490);江苏省自然科学基金面上项目(BK20201436);江苏省住建厅建设系统科技项目(2018ZD047);江苏高校“青蓝工程”中青年学术带头人(2020);扬州大学(高端人才支持计划)。

摘　　要：为研究粘贴碳纤维布对钢筋ECC-混凝土复合梁的增强效果,设计制作了三组共12根粘贴碳纤维布增强的钢筋ECC-混凝土复合梁试件进行静力受弯性能试验研究。通过分析碳纤维布粘贴层数、环箍对不同ECC替换高度率的ECC-混凝土复合梁的受拉纵筋应变、裂缝宽度、挠度、承载能力等性能,研究粘贴碳纤维布对复合梁受弯性能的影响。基于合理的基本假定和简化的材料本构模型,推导粘贴碳纤维布的钢筋ECC-混凝土复合梁的正截面受弯破坏界限配筋率及承载力简化计算公式。结果表明,与未贴布试件相比,粘贴碳纤维布可减小复合梁的裂缝宽度,提高试件极限荷载,且随增强层数的增加,最大提高了63%。配有环形锚固增强的试件较未设环箍增强的试件,极限承载力提高了8.6%。极限承载力公式计算值与试验实测值吻合良好,可供工程实践参考。In order to study the strengthen effect of carbon fiber sheet(CFS) on reinforced ECC-concrete composite beams, three groups with totally 12 specimens of reinforced ECC-concrete composite beams strengthened by CFS are designed and their static flexural experiments are made. Beams with different ECC replacement height ratios, layers of pasted CFS and CFS hoops are conducted. The effect of pasted CFS on the flexural behavior of strengthened composite beams, in terms of strain, crack width, deflection and bearing capacity, is investigated. Based on reasonable assumptions and materials simplified constitutive models, simplified calculate formulas for balanced reinforcement ratio and flexural bearing capacity of CFS strengthened ECC-concrete composite beam are derived. The results shows that, compared with unstrengthened specimens, CFS strengthen can reduce the specimen’s crack width and improve its bearing capacity, and with the increase of the layers of strengthened CFS, the maximum bearing capacity is improved by 63%. Compared with the specimens without CFS hoops, the bearing capacity of specimens with CFS hoops is improved by 8.6%. The predicted results calculated by the derived formulas are in good agreement with the experimental results, illustrating it can be used in engineering practice.

关 键 词：碳纤维布 ECC 混凝土 复合梁 受弯性能 

分 类 号：TU375.1[建筑科学—结构工程]